JP5868553B1 - Circuit breaker characteristic monitoring device - Google Patents

Abstract

The present invention is a circuit breaker characteristic monitoring device (1) for monitoring the operation of a circuit breaker and estimating the amount of consumption of a movable contact (31) and a stationary contact (32) provided in the circuit breaker, At least one of the closing time, which is the time required from when the circuit breaker starts to close, to the closing time, and the opening time, which is the time required from when the circuit breaker starts opening, to the opening time Based on the operation time measurement unit (11) for measuring one, the measurement result in the operation time measurement unit (11), and the moving speed of the movable contact (31) in the closing operation or opening operation from which the measurement result was obtained And a contact consumption amount estimation unit (12) for estimating consumption amounts of the movable contact (31) and the stationary contact (32).

Description

  The present invention relates to a circuit breaker characteristic monitoring device for monitoring the characteristics of a circuit breaker installed in a substation, a switching station or the like.

  Conventionally, in a device for monitoring the characteristics of a circuit breaker, the circuit breaker contact is closed after the command is issued, which is the time from when the command is issued during the circuit breaker operation until the circuit breaker contact opens. The closing time, which is the time until the pole is opened, the opening speed, which is the speed when the circuit breaker contact starts moving and the opening speed, and the closing speed, which is the speed when the circuit breaker contact starts moving, are monitored. Was. For example, in the invention described in Patent Document 1, the circuit breaker abnormality is detected by finely dividing the opening time and monitoring changes in each time after the division. Further, Patent Document 2 detects a rising point and a minimum point of a control current waveform at the time of turning on, an operation start point of a rotation operation shaft, a predetermined angle rotation point, and a full angle rotation point, and a time between each point. An invention is disclosed in which a sign of an abnormality of a circuit breaker is grasped by comparing the distance or distance with a reference value.

JP-A-61-203517 Japanese Patent Laid-Open No. Sho 62-226519

  In the above-described conventional technique, it is possible to detect an abnormality of the circuit breaker and to grasp an abnormality sign, but there is a problem that it is impossible to detect the degree of consumption of the consumable item. In other words, the contact portion of the circuit breaker is consumed due to wear and dissolution each time the opening operation and the closing operation are repeated. For this reason, it is necessary to replace the wear amount when the wear amount reaches a certain value. However, the conventional technique cannot detect the degree of wear of the consumable item. Conventionally, for example, in periodic inspections and inspection work when abnormalities are detected, it is necessary to judge the necessity of replacement by visual inspection or the like, and there is a problem that it is difficult to grasp the appropriate replacement timing of consumables .

  The present invention has been made in view of the above, and an object of the present invention is to obtain a circuit breaker characteristic monitoring device capable of detecting a timing at which a consumable part of a circuit breaker needs to be replaced.

In order to solve the above-described problems and achieve the object, the present invention includes a movable contact and a fixed contact, and the movable contact starts to move from a first specified position in the opening operation. After moving away from the fixed contact, the movement continues to move to a second prescribed position different from the first prescribed position, and in a closing operation, the movement starts from the second prescribed position and after contact with the fixed contacts be continued to move the consumption of the first defined the movable contacts positioned to monitor the operation of the circuit breaker to be moved the breaker to has and the fixed contact a circuit breaker characteristic monitor device for estimating, from the breaker closing time and the circuit breaker is a time required to closing from the start of the closing operation starts to the opening operation At least the opening time, which is the time required to open the electrode, An operation time measurement unit for measuring either, if the operation time measuring section has measured the closing time, distance and the closing operation between the second prescribed position and the first defined position The moving time of the movable contact is calculated based on the moving speed of the movable contact at, the calculated moving time is compared with the closing time, and the difference between the moving time and the closing time is When the threshold value is 1 or less, it is estimated that the consumption amount exceeds a certain value, and when the operation time measurement unit measures the opening time, the distance and the movable contact in the opening operation Based on the moving speed of the child, the moving time of the movable contact is calculated, the calculated moving time is compared with the opening time, and the difference between the moving time and the opening time is the second value. If the amount of wear exceeds a certain value when the threshold is exceeded Characterized in that it comprises a contactor consumption estimator for constant, the.

  According to the present invention, it is possible to estimate the consumption amount of the consumables constituting the circuit breaker, and it is possible to replace the consumables at an appropriate timing.

The figure which shows the structural example of the system to which the circuit breaker characteristic monitoring apparatus concerning this invention is applied. The figure explaining the method of estimating the amount of consumption of consumables based on closing time The figure explaining the method of estimating the amount of consumption of consumables based on opening time

  Hereinafter, an embodiment of a circuit breaker characteristic monitoring device according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a diagram showing a configuration example of a system to which a circuit breaker characteristic monitoring device according to the present invention is applied. The circuit breaker characteristic monitoring device 1 monitors the characteristics of a circuit breaker installed in a substation, a switching station, or the like, specifically, a circuit breaker including the operation device 2 and the arc extinguishing chamber 3.

  The circuit breaker characteristic monitoring device 1 includes an operation time measurement unit 11 and a contact consumption amount estimation unit 12, and is configured to be connected to an external device such as a personal computer (PC).

  In the circuit breaker, the controller device 2 includes an opening electromagnet 21, a closing electromagnet 22, an output lever 23, and an operation speed measurement unit 24. The arc extinguishing chamber 3 includes a movable contact 31 and a fixed contact 32. The output lever 23 is configured to be rotatable around a rotation axis (not shown). A movable contact 31 is connected to the output lever 23. That is, the movable contact 31 moves with the rotation of the output lever 23. Therefore, when performing the opening operation for switching from the state in which the movable contact 31 and the fixed contact 32 are electrically connected to the state in which they are not connected, the output lever 23 is rotated in the first direction. On the other hand, when the closing operation for switching from the state where the movable contact 31 and the stationary contact 32 are not electrically connected to the connected state is performed, the output lever 23 is in the second direction opposite to the first direction. Turn in the direction of. The controller device 2 performs an opening operation or a closing operation when a predetermined condition is satisfied. For example, when it is detected that the current flowing through a load (not shown) connected via the fixed contact 32 exceeds a certain value, the opening operation is performed. In the opening operation, a current is supplied to the opening electromagnet 21 to generate a magnetic field, and the output lever 23 is rotated in the first direction. In the closing operation, a current is passed through the closing electromagnet 22 to generate a magnetic field, and the output lever 23 is rotated in the second direction. The operation speed measurement unit 24 measures the moving speed of the movable contact 31 in the opening operation and the closing operation. The moving speed is calculated based on the position of the movable contact 31. The position can be measured by a method similar to the conventional method described in Patent Documents 1 and 2, for example. For example, a bar code may be attached to a movable part such as the output lever 23 and the movable contact 31, and the measurement may be performed by optically reading the bar code. The operation speed measurement unit 24 measures the position of the movable contact 31 a plurality of times in the opening operation and the closing operation, and calculates the moving speed based on the measurement time and the measurement result. The operation speed measurement unit 24 notifies the circuit breaker characteristic monitoring device 1 of the moving speed of the movable contact 31.

  In the circuit breaker characteristic monitoring device 1, the operation time measuring unit 11 starts the opening time, which is a required time from when the circuit breaker starts the opening operation to the opening state, and the circuit breaker starts the closing operation. Then, the closing time, which is the time required until the closing state is reached, is measured. The opening time is a time required until the movable contact 31 and the fixed contact 32 are separated after a control current instructing the opening flows. The closing time is a time required from when a control current for instructing closing flows until the movable contact 31 and the fixed contact 32 come into contact with each other. The opening time can be measured based on the control current and load current flowing through the open circuit electromagnet 21. The operating time measuring unit 11 determines that the opening operation has started when a control current for instructing opening of the opening electromagnet 21 flows, starts measuring the opening time, and when the load current becomes zero. It is determined that the contact has been opened, and the measurement is terminated. The closing time can be measured based on the control current flowing through the closing electromagnet 22 and the load current. The operating time measuring unit 11 determines that the closing operation starts when the control current for instructing closing flows to the closing electromagnet 22 and starts measuring the closing time. When the load current flows, the operating time measuring unit 11 starts closing. It is determined that the state has been reached and the measurement is terminated.

  In the opening operation and the closing operation, the distance that the movable contact 31 moves is fixed. In the closing operation, the movable contact 31 continues to move even after coming into contact with the fixed contact 32 and stops when it reaches the first specified position. Similarly, in the opening operation, the movable contact 31 continues to move after being separated from the fixed contact 32 and stops when it reaches the second specified position. That is, the movable contact 31 moves from the second specified position to the first specified position in the closing operation, and moves from the first specified position to the second specified position in the opening operation. However, in the circuit breaker, in the closing operation, after the movable contact 31 moves beyond the first specified position, it returns to the opposite direction by a minute distance and then stops at the first specified position. There are also things.

  The contact consumption amount estimation unit 12 determines the operation time that is the opening time or the closing time measured by the operation time measurement unit 11 and the moving speed of the movable contact 31 during the opening operation or the closing operation. Based on this, the consumption amount of the movable contact 31 and the fixed contact 32 is estimated.

  A method in which the contact consumption amount estimation unit 12 estimates the consumption amounts of the movable contact 31 and the fixed contact 32 will be described with reference to FIGS. 2 and 3. FIG. 2 is a diagram for explaining a method of estimating the consumption amount based on the closing time. FIG. 3 is a diagram for explaining a method of estimating the consumption amount based on the opening time. In FIG. 2 and FIG. 3, “contact point” shown on the vertical axis indicates a contact state between the movable contact 31 and the fixed contact 32. Low indicates an open state where the movable contact 31 and the fixed contact 32 are not in contact, and High indicates a closed state where the movable contact 31 and the fixed contact 32 are in contact. 2 and 3, the timing at which the movable contact 31 and the fixed contact 32 come into contact is expressed as a contact ON, and the timing at which the movable contact 31 and the fixed contact 32 leave is expressed as a contact OFF. “Travel” indicates the position of the movable contact 31 when the second predetermined position, which is the position where the movable contact 31 is farthest from the fixed contact 32, is used as a reference. As the movable contact 31 approaches the fixed contact 32, the value of “travel” increases. That is, “travel” corresponds to the distance from the second specified position to the movable contact 31. The “control current waveform” indicates the waveform of the control current flowing through the opening electromagnet 21 or the closing electromagnet 22. The “control current waveform” in FIG. 2 shows the waveform of the control current flowing through the coil constituting the closing electromagnet 22. The “control current waveform” in FIG. 3 shows the waveform of the control current flowing through the coil constituting the open circuit electromagnet 21. As shown in the figure, it is known that the control current increases at the start of the closing operation and at the start of the opening operation.

  As shown in FIG. 2, in the case of the closing operation, the closing time becomes longer as the consumption amount of the movable contact 31 and the fixed contact 32 becomes larger. That is, after the movable contact 31 starts moving toward the fixed contact 32, the timing at which the contact is turned on by contacting the fixed contact 32 (timing for closing) is delayed. As shown in FIG. 3, in the case of the opening operation, the opening time is shortened as the consumption amount of the movable contact 31 and the fixed contact 32 is increased. That is, the opening timing is accelerated.

  In consideration of such characteristics, the contact consumption estimation unit 12 determines the consumption of the movable contact 31 and the fixed contact 32 based on the closing time or opening time and the moving speed of the movable contact 31. Is estimated.

  Specifically, when the consumption amount is estimated based on the closing time and the moving speed of the movable contact 31, the contact consumption amount estimation unit 12 performs the closing operation based on the moving speed of the movable contact 31. The moving time of the movable contact 31 is calculated. Then, the moving time of the movable contact 31 in the closing operation is compared with the closing time. Here, the moving time of the movable contact 31 in the closing operation is the distance between the position of the movable contact 31 at the start of the closing operation and the position of the movable contact 31 at the end of the closing operation. This is the time required to move. Hereinafter, this time is referred to as operation time. As described above, since the distance that the movable contact 31 moves in the closing operation is fixed, the contact consumption amount estimation unit 12 moves the moving speed measured by the operation speed measurement unit 24, that is, the moving amount in the closing operation. The operation time can be calculated based on the moving speed of the contact 31. The distance that the movable contact 31 moves in the closing operation is stored in, for example, a storage unit (not shown). When the difference between the operating time of the movable contact 31 in the closing operation and the closing time, which is the moving time of the movable contact 31 until closing, is equal to or less than a predetermined threshold value, the amount of consumption is large and the consumption It is determined that the product needs to be replaced, that is, the movable contact 31 and / or the fixed contact 32 need to be replaced. When it is determined that replacement of the consumables is necessary, the movable contact 31 and the fixed contact 32, which are consumables, are inspected using a display unit (not shown) or a connected PC or other means. Notify outside that replacement is required. In addition, since the moving speed of the movable contact 31 in the closing operation is constant unless a failure or the like occurs, information on the operation time of the movable contact 31 in the closing operation is calculated in advance, for example, illustration is omitted. You may make it hold | maintain beforehand with a memory | storage part.

  When the closing time is measured by the operation time measurement unit 11, the contact consumption amount estimation unit 12 estimates the consumption amount by comparing with the closing time measured in the past by the operation time measurement unit 11. Good. In this case, the difference between the previously measured closing time and the newly measured closing time is the estimated consumption amount. The closing time measured in the past is the closing time measured in the first closing operation after replacing the consumables.

  When the consumption amount is estimated based on the opening time and the moving speed of the movable contact 31, the contact consumption amount estimation unit 12 moves the movable contact during the opening time based on the moving speed of the movable contact 31. Calculate time. Then, the moving time of the movable contact 31 in the opening operation and the opening time are compared. The moving time of the movable contact 31 in the opening operation is equal to the above-described “moving time of the movable contact 31 in the closing operation”. When the difference between the operating time of the movable contact 31 in the opening operation and the opening time, which is the moving time of the movable contact 31 until opening, is equal to or greater than a predetermined threshold value, the amount of consumption is large and the consumption Judge that the product needs to be replaced. The operation time information of the movable contact 31 in the opening operation may be calculated in advance, and may be stored in advance, for example, in a storage unit (not shown).

  When the contact opening time estimation unit 12 measures the opening time, the contact consumption amount estimation unit 12 estimates the consumption amount by comparing with the opening time measured in the past by the operation time measurement unit 11. Good. In this case, the difference between the previously measured opening time and the newly measured opening time is the estimation result of the consumption amount. The opening time measured in the past is the opening time measured in the first opening operation after exchanging consumables.

  The consumption amount estimation by the contactor consumption amount estimation unit 12 may be performed in both the closing operation and the opening operation, or may be performed in either one of the operations.

  As described above, the circuit breaker characteristic monitoring device according to the present embodiment has a closing time, which is a time from the start of the closing operation to the closing, and from the start of the opening operation to the opening of the opening. Based on both or one of the opening times that are the time and the moving speed of the movable contact, the movable contact and the fixed contact that are consumables that are consumed when the closing operation and the opening operation are performed. The amount of consumption was estimated. In addition, when the consumption amount reaches a specified value, it is notified to the outside that the consumable item needs to be replaced. Thereby, it becomes possible to exchange consumables at an appropriate timing. In addition, it is possible to realize a reduction in work cost for maintenance and inspection and a reduction in parts cost.

  DESCRIPTION OF SYMBOLS 1 Circuit breaker characteristic monitoring apparatus, 2 Operation apparatus, 3 Arc-extinguishing chamber, 11 Operation time measurement part, 12 Contact consumption estimation part, 21 Opening electromagnet, 22 Closing electromagnet, 23 Output lever, 24 Operation speed measurement part, 31 movable contacts, 32 fixed contacts.

Claims (3)

The movable contact includes a movable contact and a fixed contact. In the opening operation, the movable contact starts to move from the first specified position and continues to move even after moving away from the fixed contact. It moves to a second prescribed position that is different from the prescribed position, and in the closing operation, the movement is continued from the first prescribed position by starting the movement from the second prescribed position and contacting the fixed contact. It monitors the operation of the circuit breaker to be moved to a position a breaker characteristic monitor device for estimating the wear amount of the movable contact and the fixed contact to which the circuit breaker is provided,
The circuit breaker is a required time to closing time, and the circuit breaker is a time required to closing from the start of the closing operation is opening from the start of the opening operation opening An operation time measuring unit that measures at least one of the time;
When the operation time measurement unit measures the closing time, based on the distance between the first specified position and the second specified position and the moving speed of the movable contact in the closing operation, The moving time of the movable contact is calculated, the calculated moving time is compared with the closing time, and when the difference between the moving time and the closing time is equal to or less than a first threshold value, the consumption amount When the operation time measuring unit measures the opening time, the movable contact is based on the distance and the moving speed of the movable contact in the opening operation. The travel time is calculated, and the calculated travel time is compared with the opening time. When the difference between the travel time and the opening time is equal to or greater than a second threshold value, the consumption amount is constant. A contact consumption estimation unit that estimates that the value is exceeded ,
A circuit breaker characteristic monitoring device comprising: The operating time measuring unit is
The first process of measuring the closing time on the basis of a first control current and load current is the current flowing to the load via the circuit breaker flows through the circuit closing electromagnet used in the closing operation, and the second process of measuring the contact opening time period based on the second control current and the load current flowing in the circuit opening electromagnet for use in opening operation, performs at least one of,
The circuit breaker characteristic monitoring device according to claim 1. The contact consumption estimation unit is
If the consumable amount estimated exceeds a certain value, and notifies to the outside that required replacement of the movable contact and the fixed contacts,
The circuit breaker characteristic monitoring apparatus according to claim 1 or 2 , characterized by the above.

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